JAMB Chemistry 1990 past questions

Equal volumes of CO, SO2 NO2 and H2S, were released into a room at the same point and time. Which of the following gives the order of the room?

Proton 16 17 19 Electron 13 16 17 19 Neutron 14 16 35 20 Which of the four atoms P,Q,R and S in the above data can be described by the following properties: relative atomic mass is greater than 30 but less than 40 ; it has an odd atomic number and forms a unipositive ion in solution?

Which of the following terms indicates the number of bonds that can be formed by atom?

X(g) X(g). The type of energy involved in the above transformation is

10.0 dm3 of air containing H2S as an Impurity was passed through a solution of Pb(NO3)2 until all the H2S had reacted. The precipitate of PbS was found weight 5.02 g. According to the equation: Pb(NO3)2 + H2O ’! PbS “!+2HNO3 the percentage by volume of hydrogen sulphides in the air is.

The effluent of an industrial plant used ins the electrolysis of concentrated brine, with a flowing mercury cathode may contain impurities like.

The solubility in moles per dm3 of 20 g of CuSO4 dissolved in 100 g of water at 180oC is

Smoke consists of

NaC2O4 + CaCl CaC2O4 + 2NaCl. Given a solution of 1.9 g of sodium oxalate in 50 g of water at room temperature, calculate the minimum volume of 0.1 M calcium oxalate required to produce maximum calcium oxalate using the above equation.

2.0 g of monobasic acid was made up to 250 cm3 with distilled water. 25.00 cm3 of this solution required 20.00 cm3 of 0.1 M NaOH solution for complete neutralization. The molar mass of the acid is

What is concentration of H+ ions in moles per dm3 of a solution of pH 4.398?

What volume of 11.0 M hydrochloric acid must be dilute to obtain 1 dm3 of 0.05 M acid?

If 10.8 g of silver is deposited in a silver coulometer connected in series with a copper coulometer, the volume of oxygen liberated is

0.1 faraday of electricity deposited 2.95 g of nickel during electrolysis is an aqueous solution. Calculate the number of moles of nickel that will Be deposited by 0.4 faraday

Cr2O7 2- + 6Fe2+ + 14H+ 2Cr3+ + 6Fe3+ + 7H2O. In the above chromium change from.

Fe2O3(s) + 2Al Al2O3 + 2Fe(s) are –1670 kJ mol-1 and –822kJ mol-1 respectively, the enthalpy change in kJ for the reason is

Iron galvanized with zinc catholically protected from corrosion. This is because

Which of the following samples will react faster with dilute dtrioxonitrate (V) acid?

In the reaction , 2Hl(g) H2(g) + I2(g), H = 10 kJ; the concentration of iodine in the equilibrium mixture can be increased by

Which of the following gases can be collected by upward displacement of air?

The brown fumes given off when trioxonirate (V) acid consist of

Which of the following tests will completely identify any one of sulphur (lV) oxide, hydrogen, carbon (lV) oxide and nitrogen (ll) oxixde?

In the Haber process for the manufacture of ammonia, the catalyst commonly used is finely divided.

Which of the following metals will liberate hydrogen form steam or dilute acid?

Coal fire should not be used in poorly ventilated rooms because

The major component of the slag from the production of iron is

Sodium hydroxide should be stored in properly closed containers because it

To make coloured glasses, small quantities of oxides of metals which form coloured silicates are often added to the reaction mixture consisting of Na2CO3 and SO2. Such a metal is

Which of the following compounds gives a yellow residue when heated and also reacts with aqueous sodium hydroxide to give a white gelatinous precipitate soluble in excess sodium hydroxide solution.

What is the IUPAC name for the hydrocarbon CH3 CH3—C = CH— CH—CH3 CH2 CH3

CH3 = CH P. Compound P, in the above reaction, is.

The label on a reagent bottle containing a clear organic liquid dropped off. The liquid was neutral to litmus and gave a colourless gas with metallic sodium. The liquid must be an

COOH COOH + H2O + NaOH COOH COO-Na+ The above reaction is an example of

Alkanoic acids have low volatility compared with Alkanoic because they

Which of the following is formed when maltose reacts with concentrated tetraoxosulphate (Vl) acid.